Question

define corals????? ??????????

Answer 1

hard stony substance secreted by certain marine coelenterates as an external skeleton, typically forming large reefs in warm seas.

"a coral reef"

Answer 2

a sedentary coelenterate of warm and tropical seas, with a calcareous, horny, or soft skeleton. Most corals are colonial and many rely on the presence of green algae in their tissues to obtain energy from sunlight.